[AD COGNOSCENDUM ORTUM SOLIS ET EIUS OCCASUM, QUE VOCATUR VULGARITER CREPUSCULUM.] Set the nadir of thy sonne up-on 18 degrees of heighte among thyn almikanteras on the west syde, and ley thy label on the degree of thy sonne, and thanne shal the poynt of thy label schewe the spring of day. Also set the nadir of thy sonne up-on 18 degrees of heighte a-mong thyn almikanteras on the est side, and ley over 5 thy label up-on the degree of the sonne, and with the point of thy label find in the bordure the ende of the evening, that is, verrey night. The nadir of the sonne is thilke degree that is opposit to the degree of the sonne, in the seventhe signe, as thus: every degree of Aries by ordre is nadir to every degree of Libra 10 by ordre; and Taurus to Scorpion; Gemini to Sagittare; Cancer to Capricorne; Leo to Aquarie; Virgo to Pisces; and yif any degree in thy zodiak be dirk, his nadir shal declare him. And for the more declaracioun, lo here thy figure. 7. TO KNOWE THE ARCH OF THE DAY, THAT SOME FOLK CALLEN THE DAY ARTIFICIAL, FROM THE SONNE ARYSING TIL HIT GO TO RESTE. [AD COGNOSCENDUM ARCHUM DIEI, QUEM VULGUS VOCAT DIEM ARTIFICIALEM, IN HOC, AB ORTU SOLIS USQUE AD OCCASUM.] Set the degree of thy sonne up-on thyn est orisonte, and ley thy label on the degree of the sonne, and at the poynt of thy label in the bordure set a prikke. Turn thanne thy riet aboute til the degree of the sonne sit up-on the west orisonte, and ley thy label up-on the same degree of the sonne, and at the point of 5 thy label set a-nother prikke. Rekne thanne the quantitee of tyme in the bordure by-twixe bothe prikkes, and tak ther thyn ark of the day. The remenant of the bordure under the orisonte is the ark of the night. Thus maistow rekne bothe arches, or every porcion, of whether that thee lyketh. And by this manere 10 of wyrking maistow see how longe that any sterre fix dwelleth above the erthe, fro tyme that he ryseth til he go to reste. But the day natural, that is to seyn 24 houres, is the revolucioun of the equinoxial with as moche partie of the zodiak as the sonne of his propre moevinge passeth in the mene whyle. And for the 15 more declaracioun, lo here thy figure. 8. TO TURN THE HOURES IN-EQUALES IN HOURES EQUALES. [AD CONVERTENDUM HORAS INEQUALES IN HORAS EQUALES.] Knowe the nombre of the degrees in the houres in-equales, and departe hem by 15, and tak ther thyn houres equales. And for the more declaracioun, lo here thy figure. 9. TO KNOWE THE QUANTITEE OF THE DAY VULGARE, THAT IS TO SEYEN, FROM SPRING OF THE DAY UN-TO VERREY NIGHT. [AD COGNOSCENDUM QUANTITATEM DIEI VULGARIS, VIZ. AB ORTU DIEI USQUE AD NOCTEM.]